Re: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, Segher Boessenkool writes: > On Wed, Dec 14, 2022 at 04:26:54PM +0800, Jiufu Guo wrote: >> Segher Boessenkool writes: >> > On Mon, Aug 29, 2022 at 11:42:16AM +0800, Jiufu Guo wrote: >> >> li %r9,-1 >> >> rldicr %r9,%r9,0,0 >> >> cmpd %cr0,%r3,%r9 >> > >> > FWIW, I fi

Re: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

On Wed, Dec 14, 2022 at 04:26:54PM +0800, Jiufu Guo wrote: > Segher Boessenkool writes: > > On Mon, Aug 29, 2022 at 11:42:16AM +0800, Jiufu Guo wrote: > >> li %r9,-1 > >> rldicr %r9,%r9,0,0 > >> cmpd %cr0,%r3,%r9 > > > > FWIW, I find the winnt assembler syntax very hard to

Re: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, Jiufu Guo via Gcc-patches writes: > Hi, > > Segher Boessenkool writes: > >> Hi! >> >> Sorry for the tardiness. >> >> On Mon, Aug 29, 2022 at 11:42:16AM +0800, Jiufu Guo wrote: >>> When checking eq/ne with a constant which has only 16bits, it can be >>> optimized to check the rotated data.

Re: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, Segher Boessenkool writes: > Hi! > > Sorry for the tardiness. > > On Mon, Aug 29, 2022 at 11:42:16AM +0800, Jiufu Guo wrote: >> When checking eq/ne with a constant which has only 16bits, it can be >> optimized to check the rotated data. By this, the constant building >> is optimized. >> >>

Re: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi! Sorry for the tardiness. On Mon, Aug 29, 2022 at 11:42:16AM +0800, Jiufu Guo wrote: > When checking eq/ne with a constant which has only 16bits, it can be > optimized to check the rotated data. By this, the constant building > is optimized. > > As the example in PR103743: > For "in == 0x800

Ping^5: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, I would like to ping this: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html BR, Jeff (Jiufu) Jiufu Guo via Gcc-patches writes: > Hi, > > Gentle ping: > https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html > > BR, > Jeff(Jiufu) > > Jiufu Guo via Gcc-patches wr

Ping^4: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, Gentle ping: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html BR, Jeff(Jiufu) Jiufu Guo via Gcc-patches writes: > Hi, > > Gentle ping this: > https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html > > BR, > Jeff (Jiufu) > > > Jiufu Guo via Gcc-patches writes: >

Ping^3: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, Gentle ping this: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html BR, Jeff (Jiufu) Jiufu Guo via Gcc-patches writes: > Gentle ping: > https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html > > BR, > Jeff (Jiufu) > > Jiufu Guo via Gcc-patches writes: > >> Pi

Ping^2: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Gentle ping: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html BR, Jeff (Jiufu) Jiufu Guo via Gcc-patches writes: > Ping: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html > > BR, > Jeff(Jiufu) > > > Jiufu Guo writes: > >> Hi, >> >> When checking eq/ne with a

Ping: [PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Ping: https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600475.html BR, Jeff(Jiufu) Jiufu Guo writes: > Hi, > > When checking eq/ne with a constant which has only 16bits, it can be > optimized to check the rotated data. By this, the constant building > is optimized. > > As the example i

[PATCH V6] rs6000: Optimize cmp on rotated 16bits constant

Hi, When checking eq/ne with a constant which has only 16bits, it can be optimized to check the rotated data. By this, the constant building is optimized. As the example in PR103743: For "in == 0x8000LL", this patch generates: rotldi %r3,%r3,16 cmpldi %cr0,%r3,32768 i